Performance analysis of asymmetrical RC structures using different configurations of shear wall

Abstract

The construction of unsymmetrical or irregular buildings is increasing due to functional requirements and aesthetic considerations. Ductility, lateral strength and stiffness are the major factors which affect the seismic behaviour of all buildings. The irregular shape, dimensions, and geometry of a building have a significant impact during an earthquake. Buildings with simple geometry in the plan have endured strong earthquakes in the past with little damage; however, buildings with asymmetric shapes have been severely damaged. Structural damage and failure in asymmetric buildings during powerful ground motions are due to torsional effects and should be minimised by shortening the distance between the centres of mass and stiffness. In the present study, torsion is minimised according to the centre of mass and rigidity and analysis of the buildings (B1 + G + 10) storey with different irregular (L, H, U and E) shapes considering different shapes of shear walls at different locations. The location of the shear wall is decided according to the centre of mass and rigidity. The analysis has been done in ETABS software tool. Variables such as the torsional effect, displacement, storey drift, stiffness, base shear and time period, and modal mass participation ratio were analysed for several models, and the findings were compared. The results prove that T shape shear wall performs better in all irregular buildings.